net/ixgbe: return unknown speed in status
net/ixgbe: return unknown speed in status

rte_ethdev has declared new NUM_UNKNOWN speed which
could be used in case when no speed information is available

Signed-off-by: Ivan Dyukov <7201bbc590289db924bd55e2c7d4827e1373599f@samsung.com>
Reviewed-by: Wei Zhao <55941fd0e75edbdf274af2cfac8f147525678f08@intel.com>

john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk,john-mcnamara-intel/dpdk